Dental flask



I (No Model.)

W. s. CURTIS DENTAL FLASK.

' No. 374,585. Patented Dec 13, 1887..

UNITED STATES PATENT OFFICE.

WALTER s. oonrrsor. WEST RANDOLPH, VERMONT.

- DENTAL FLASK.

SPBCIFICATIQN forming part of Letters Patent 1 0.374.58 dated December 13.188

' Application fil ed April 11, res-i.

To all whom it may concern.

Be it known that I, WALTER S. Courts-of \Vest Randolph, in the county of Orange and State of Vermont,have invented a new and useful Improvement in Dental Flasks; and I do hereby declare that the following is a full,

clear, and exact descript-ionof the same, refereuce being bad to the accompanying drawings, forming part of this specification.

This invention has reference to what are known as dental flasks, and which are used for the purpose of uniting the artificial teeth to the artificial gum under pressure. I

The invention consists in providing the flask with two angular or wedge-shaped guides on opposite sides and projecting from and forming a part of the rim of the cope or upper part of the flask, and two corresponding slots on the rim of the nowel or lower part of the flask, into which the guides pass and tightly fit when the two parts of the flask are forced together, and enabling the material in the upper part of the flask to unite' naturally with that in the lower part of theflask, the

downward direction of" the upper part of the flask in the process of uniting it with the lower part not being confined to any particular angle, as will be more fully set forth hereinal'ter.

the plaster cast is secured preparatory to pressing the plastic base onto and around' the teeth.

The gums are made of celluloid or other plastic material, and the teeth are secured by forcing the roots into the previously-prepared gums. r p

In the construction of a plastic upper plate of teeth it is essential that the upper part of the flask pass downward more or less 01)- liquely, varying according to the under-cut. By this improved. method, the guides being free to move downward more or less obliquely,

as the particular case in hand requires and'as Serial No. games. (N0 model.)

is desired, the downward direction is governed by the lateral pressure, the lateral displace; ment of the gum will be uniform, and the plaster mold will not be broken or crumbled and mixed with the plastic'gum, and as there is no binding of the guides nor pressure of the gum on the edges of the plaster mold, much. less pressure is required to bring the two parts of the flask together than by-auy method here- I tofore'in use, and there is consequently much less danger of displacing the teeth set in the plaster mold.

In the construction of a plastic under plate I of teeth the downward direction of the upper part of the flask is prop'erly nearly vertical. By this improved method this vertiealdownward direction is accomplished with 'thesame desirable results as above described, as will be seen. r

In separating a dental flask after forming a plaster mold for an upper plate of teeth, it is essential that the rear'of the top part of theflask be raised from its position first, and more rapidly than the front part, so as not to injure the portion ofthe mold forming the under-cut. This is easily accomplished by this improved method, as the novel shape of the guides readily admits of the rear part being raised to any point desired while the" two front portions of the flask remain to- 8 This flask also readily admits of the gcther. vertical upward direction required when s'ep-. arating the flask after the preparation-of the mold for an under plate of teeth.

Having thus fully described my invention,

In a dental flask, and in combination, the upper part, A, having lugs projecting downward uponeither'side, the said lugshaving one of their sides extending vertically throughout their whole extent, and. one side inclined what I claim as new, and ,desire to secure by Y Letters Patent of the United States, is.-

from the lower end of the lug all the way to? the edge of the said upper part, .A, and lugs formed upon the lower part, said lugs having I inclined andvertieal sides formed to corre-p spondwith the lugs of the upper part, all substantially as described.

' In testimony whereof I have signed my name to this specification in the presence ot' two snbio'sf scribing witnesses.

- WALTER S. CURTIS; Witnesses:

A. B. THOMAS, W. H. NICHOLS. 

